I have exactly the same issue with the same timescales - i.e had the amp for 4 years.
Here's a copy of my correspondence with line 6:
age:
oschildt Oct 21, 03:24 AM
Hi,
unfortunately this sound like a hardware issue of the amp.
You could try to perform a factory reset on the Spider Jam:
hold down the settings/tone button as you turn on the power and hold the button for 5-8 seconds.
This will erase all current presets and restore the factory sounds.
But if that doesn't help, please contact our UK service center:
E & M Electronics
10 Peverel Drive, Granby, Milton Keynes,
Buckinghamshire, MK1 1NL
+441908 375699
line6@eandm.co
Best regards
Olaf Schildt
Technical Support
Line 6 Support Europe
I have tried the factory reset to no avail. I currently have an e-mail out to the above (enquiries@random.com - or maybe .co.uk) and am awaiting a reply
I'd be interested in your feedback as to solutions. I'll update you when I hear from E & M
